W/System.err( 450): java.lang.IllegalArgumentException: DTEND and DURATION cannot both be null for an event.
W/System.err( 450): at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:167)
W/System.err( 450): at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:137)
W/System.err( 450): at android.content.ContentProviderProxy.insert(ContentProviderNative.java:476)
W/System.err( 450): at android.content.ContentResolver.insert(ContentResolver.java:1207)
W/System.err( 450): at jp.classmethod.us.android.icalsync.helper.CalendarHelper.entryUpdateEvent(CalendarHelper.java:349)
W/System.err( 450): at jp.classmethod.us.android.icalsync.helper.CalendarHelper.entryUpdateEventList(CalendarHelper.java:232)
W/System.err( 450): at jp.classmethod.us.android.icalsync.sync.SyncAdapter.onPerformSync(SyncAdapter.java:111)
W/System.err( 450): at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:259)
E/SyncAdapter( 450): jp.classmethod.us.android.icalsync.exception.SystemException
D/SyncAdapter( 450): Sync end